Brain Test Level 422
Question
Find the missing number in the sequence: 1, 1, 2, 3, 5, 8, 13, ?
Solution
This sequence is known as the Fibonacci sequence. Each number is the sum of the two numbers that came before it.
To find the missing number, add the last two numbers:
- 8 + 13 = 21
Enter 21.
DIFFICULTY
Medium
PRO TIP
Focus on the relationship between the first two numbers to create the third.